To be proper pascal case with no digits allowed, a word:

• MUST start with an upper case alphabet (A through Z)
• MUST have no digits (0 - 9)
• MUST have no spaces, punctuation or special characters
• CAN have at most 1 uppercase alphabet in a row
• CAN end in an uppercase alphabet

Notable examples

• A is valid pascal case
• Ag is valid pascal case
• AaA is valid pascal case